diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index ce85e11fa..78a56966b 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -602,7 +602,7 @@ def deposit(deposit_params: bytes[2048]):
     index: uint256 = self.total_deposit_count + 2**POW_CONTRACT_MERKLE_TREE_DEPTH
     msg_gwei_bytes8: bytes[8] = slice(concat("", convert(msg.value / GWEI_PER_ETH, bytes32)), start=24, len=8)
     timestamp_bytes8: bytes[8] = slice(concat("", convert(block.timestamp, bytes32)), start=24, len=8)
-    deposit_data: bytes[2064] = concat(deposit_params, msg_gwei_bytes8, timestamp_bytes8)
+    deposit_data: bytes[2064] = concat(msg_gwei_bytes8, timestamp_bytes8, deposit_params)
 
     log.HashChainValue(self.receipt_tree[1], deposit_data, self.total_deposit_count)